SPI Bus Adapter Interleaving Data on Chip Select Line
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Solution Overview
Problem
The serial peripheral interface (SPI) bus faces limitations in data transfer speed, particularly over long distances, due to signal integrity issues, which can result in inaccurate signals and necessitate slower data transfer rates to maintain reliability, compromising its simplicity and efficiency in certain applications.
Innovation Solution
The proposed solution involves using the chip select (CS) line to transmit additional data alongside the master output peripheral input (MOPI) line, interleaving data on both lines and synchronizing it with a faster clock signal to increase data transfer speed while maintaining signal integrity, utilizing a bus adapter with a data converter and clock rate adjuster to enable efficient data transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If data transfer speed is increased, then productivity is improved, but signal integrity deteriorates
Solution Approach 1:
The patent utilizes the chip select line, which was traditionally used only for control signals, to transmit additional data bits. By adding this new dimension of data transmission, the system doubles the effective data rate without increasing the clock frequency, thereby maintaining signal integrity while improving productivity.
Solution Approach 2:
The patent segments the data transmission process into two parallel paths: one using the MOPI line and another using the chip select line. Data is transmitted on both lines simultaneously and then interleaved at the receiver, effectively dividing the data stream into smaller units that can be transmitted in parallel, doubling the data rate without compromising signal integrity.
2Productivity
If data transfer speed is increased, then productivity is improved, but device complexity increases
Solution Approach 1:
The chip select line, originally designed solely for device selection control, is made multi-functional by using it to transmit data bits as well. This universalization of the control line allows the system to double data rate without adding physical lines or complex hardware, maintaining simplicity while improving productivity.
Solution Approach 2:
The existing SPI protocol structure is leveraged to achieve faster data transfer. The master device uses its existing control lines (MOPI and chip select) in a novel way to transmit data, and the peripheral device uses its existing clock signal to synchronize the interleaved data reception. This self-service approach avoids adding complex external hardware while doubling data rate.
Data Source
AI summary
A serial peripheral interface (SPI) system including a bus adapter is disclosed. The bus adapter may include a data converter that may be adapted to receive respective first and second data from a first master output peripheral input (MOPI) line and a chip select line from a SPI master device. The data converter may also be adapted to interleave the first and second data, and the data converter may be adapted to transmit the interleaved first and second data synchronously with a second clock signal on a second MOPI line. The bus adapter may also include a clock rate adjuster adapted to generate the second clock signal to transmit to a SPI peripheral device. The second clock signal may be adapted to enable the SPI peripheral device to read the transmitted data.